my itunes app shows no content

I have a 1st Generation iPod touch, recently updated to 3.0 OS and jailbroken. As the title says, my itunes app (in the iPod) is not working properly or it shows no content at all. When I click on podcasts, videos, music, or even search... there is nothing, I can purchase nothing or download nothing through it. Every other app is working perfectly, including App Store (which also has to do with my account).

Any ideas?

I've tried reboot... it remains the same.
It would be a shame to have to restore just because of this issue.